Question

I have a table named Users, where I have two fields username and password. Similarly, I have one more table where I have few fields and username field.

I have a login page where I have to check whether the username and password is present in the Users table, and if present, I want to fetch the data from another table corresponding to that username.

There can be more than one data for a single user so I have to fetch all the data for the respective user. How can I do it?

Answer 1

You may want to use subquery… effectively two queries like this

mysql> select * from other
    -> where name = 
    -> (select name from users where name = '<USER_NAME>' and password = '<PASSWORD>');

Here is an example:

mysql> select * from users;
+------+------+----------+
| id   | name | password |
+------+------+----------+
|    1 | one  | one      |
|    2 | two  | two      |
+------+------+----------+
2 rows in set (0.00 sec)

mysql> select * from other;
+------+-------+
| id   | name  |
+------+-------+
|   20 | two11 |
|   10 | two   |
|   30 | two   |
+------+-------+
3 rows in set (0.00 sec)

mysql> select * from other where name = (select name from users where name = 'two' and password = 'two');
+------+------+
| id   | name |
+------+------+
|   10 | two  |
|   30 | two  |
+------+------+
2 rows in set (0.00 sec)